No, although the popular uses of the word “religion” are notoriously vague and ill-defined, so you would have to elaborate. Natural law ethics grounds morality

No, although the popular uses of the word “religion” are notoriously vague and ill-defined, so you would have to elaborate. Natural law ethics grounds morality in human nature. A good action accords with the telos of human nature. An evil one frustrates it. Aristotle is perhaps the best known defender of it on purely rational grounds.